4420787121 has 27 divisors (see below), whose sum is σ = 6573803691. Its totient is φ = 2862750384.

The previous prime is 4420787113. The next prime is 4420787123. The reversal of 4420787121 is 1217870244.

The square root of 4420787121 is 66489.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3955781025 + 465006096 = 62895^2 + 21564^2 .

It is not a de Polignac number, because 4420787121 - 2³ = 4420787113 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (4420787123) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7379980 + ... + 7380578.

Almost surely, 2^4420787121 is an apocalyptic number.

4420787121 is the 66489-th square number.

4420787121 is the 33245-th centered octagonal number.

It is an amenable number.

4420787121 is a deficient number, since it is larger than the sum of its proper divisors (2153016570).

4420787121 is an frugal number, since it uses more digits than its factorization.

4420787121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The cubic root of 4420787121 is about 1641.2189927062.

Multiplying 4420787121 by its sum of digits (36), we get a square (159148336356 = 398934²).

It can be divided in two parts, 44207 and 87121, that added together give a triangular number (131328 = T₅₁₂).

The spelling of 4420787121 in words is "four billion, four hundred twenty million, seven hundred eighty-seven thousand, one hundred twenty-one".